System scalability and expansion
77
For smaller deployments, you use the IBM xSeries x335, x336, or x3550
platform. You can install both the Announcements service and the Music
on Hold service on the same IBM xSeries x335, x336, or x3550 platform,
or IBM HS20 blade server platform.
For all other Media Application Server services, you must install only
one service on each Media Application Server, with the exception of the
multiapplication MAS deployment.
For the higher density deployments of the Music on Hold, or Announcements
service, you use the IBM HS20 blade servers within the IBM eServer
BladeCenter chassis. For the Music On Hold, or Announcements simplex
MAS architecture, you use one IBM HS20 blade server, with the Dual SCSI
Expansion Unit (two slots total). For the Music On Hold, or Announcements
duplex MAS architecture, you use two HS20 blade servers, with two Dual
SCSI expansion units (four slots total).
The Music on Hold or Announcements services have no built in limitations
on how many simultaneous users can exist in the network. The maximum
number of simultaneous Music On Hold, or Announcements users is limited
only by the number of channel licenses purchased, and the capacity of the
scaled system. Ports are allocated on a first-come, first-served basis until
the license keys are exhausted, or available capacity is exceeded.
For Music on Hold or Announcements, there can be only two servers for
each subdomain. This means that each subdomain can have at most two
servers assigned to it. If a domain tree has multiple subdomains then each
subdomain can have two servers assigned to it. A root domain is also
limited to just two servers assigned to it.
The Music on Hold or Announcements service takes advantage of the
scalable, multiple server capabilities of the Media Application Server
platform and makes use of the Media Application Server replicated
persistent content storage for storing media source files that are used for
Music On Hold, or Announcements. There are a maximum of two active
content storage components in Music On Hold, or Announcements service
instance (pooled entity).
The Media Application Server platform can scale from a small
single-machine solution to a large multi-machine cluster. The Media
Application Server provides scalability across multiple machines through
system-level replication. New Media Application Servers can be added to
the pool of servers at any time to meet expanding capacity requirements
(up to a maximum of two servers for each pool). Each new server must
be added to the Pooled Entity using the Provisioning Client before user
traffic is routed to it.
The available Media Application Server scaling options are
•
Simplex--One Media Application Server within one service instance that
is accessed by one static route at the Session Manager. There is one
Nortel Media Application Server
Media Application Server Planning and Engineering
NN42020-201
01.04
Standard
4.0
27 July 2007
Copyright © 2007, Nortel Networks
.
